//******************************************************************
//******************************************************************
//**********          ANts Peer To Peer Sources        *************
//
// ANts P2P realizes a third generation P2P net. It protects your
// privacy while you are connected and makes you not trackable, hiding
// your identity (ip) and crypting everything you are sending/receiving
// from others.

// Copyright (C) 2004  Roberto Rossi

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.


package ants.p2p;

public class QueryBandwidthFilterOut extends Thread{

    static int used=0;
    static int interval = 1000;
    static QueryBandwidthFilterOut instance = null;

    public QueryBandwidthFilterOut(){
        this.start();
    }

    public static QueryBandwidthFilterOut getInstance(){
      if(instance != null)
        return instance;
      else
        return instance = new QueryBandwidthFilterOut();
    }

    protected void bandwidthCheck(){
      synchronized(QueryBandwidthFilterOut.getInstance()){
    	  while (used >= NeighbourAnt.queryBandwidthLimit) {
          try {
            this.wait();
          }
          catch (Exception e) {
          }
        }
      }
    }

    public void writeQuery(long bytes){
      bandwidthCheck();
      Thread.currentThread().setPriority(10);
      used += bytes;
    }

    public void run(){
        while (true) {
        	used=(int)Math.max(0, Math.floor(used - NeighbourAnt.queryBandwidthLimit));
            this.doNotify();
            this.doSleep();
        }
    }

    public synchronized void doNotify(){
        this.notify();
    }

    public void doSleep(){
        try {
            sleep(interval);
        } catch (Exception e) {
            System.out.println("Unexpectewd Wake Up");
        }
    }
}
